Rotary hoe wheel



9' H. FEcH'rLlNG E-'rAL 2.196.857

marmur mamusi.

nld Jan." 2;; 1938 y I rafa 2, ,mma 2 fa REX? ,z z z z? ao.. MJmv w I 1i wz w 2 Z 2 latemezl' Apr, `9, 1940 f i UNITED w sTATEs noTAaYHOE'WHEEL v Walton HL. Frechning ana John Paul Ahlbmnat,

Chicago, Ill., assignors to Borg-Warner Corporation, Chicago, Ill., acorporation lof Illinois Vi' Applicat'itnianuary 21, 1938, serial Na.186,162 I I rolim. (01. 55-24) hard and immovable objects. If the Wheelswere made of ordinary grey iron casti'ngs, similar im- Malleablecastings, however, ar`e expensive and the limits to which they 'can bebent Without rupturing arev relatively. smalL'Furthermore,

though it is better that the wheel bend than break, each bend requires aseparate hand operation to restore the Wheel to its original form.

The object of this invention is to provide anIv improved hoe Wheel whichis 'lighter' andistronger than those heretofore made, and whichpossesses sufficient `resiliency to withstand severe impacts and strainsWithout sustaining permanent` deformation. i w v Another' object is toprovide ahoe Wheel which is Superior to similar Wheels made frommalleaable cast iron and is less expensive to make.

These'and other objects of this invention 'Will become apparent from thefollowing description When taken together withthe ,accompanyingdrawingwhich forms a part thereof and in which:

formed' novel hoe Wheel;

Fig. 1A is a fragmentary elevation of a coml pletely formed hoe Wheel;

Fg. 2 is avsection through the hoe Fig. 1A taken along line 2-2. v

In its preferredformthis invention comprises a hoe Wheel made. entirelyof sheet steel instead of grey or malleable cast iron'. Insteadoftapering the thickness of the hoe Wheel to get increasedrigidity atthe hub, the Wheel is corrugat'ed radially` and the corrugated innerperiphery is Welded to a steeltube whichV forms the hub of the hoeWheel.` The tips of the teeth are bent 90 to the plane of the wheel andare also curved in the direction of rotation.

Referring now to the drawing lfor a detailed wheel of description of theinvention, a fragment of a,

partly formedhoe wheel is shown in Fig l and pacts would break the teethof the Wheels and Fig. 1 is a fragmentary elevation of a partially o butis to be determined by the appendejd claim.

a'fragmentfof a completed wheel Vis-shown in 'PATENT ,OFFICE Fig. 1A.lThe vWheel .is comprised ofa` t'ubular hub 20 'which is welded to aSheet steel toothed disc 2|. Said' disc 2| has a solid inner: portionf22which is corrugated radially'. to stiffen the disc vaxially.`The'thickness of the metal at theinner4` Wheel. The teeth are taperedin width'asshown-v at 23' in Fig. 1.

It Will be noted that the twist in the :teeth occurs at about one-halfthe vlength of theteetha This gives a sufiiciently long Working surfaceand I, providesmaximum strength in the direction of i the application offorce.

The twist'ed 110mm 25 of theoteth is-curved in the directionofrotation-of the wheel to give c ated vupon 'by the wheel.

the proper turning effect tothe soil as it is-oper-v.

The weldng of the' steel tube 20 is preferably ldone at points' 'and 56around Vthe tube, thus formingfia circuitous line of, contactibetweenthev v tube and Wheel. `It Will Vbe'noted that at; these points anobtuse angle is formed between the corrugatio-ns and' the tube;v Thispermits vthe. Wel'dingelectrode (not shown) tc'v approachthev`intersection'of the vsurfaces more clos'ely and makes for a moresatisfactory Weld.

QA hoe wheel made in accordance with this'in-` vention requiresinoexpensive foundry' operations, and possesses a greatzde'al ofresilie'nce punch presses for its formation. The solid inner portion canbe maderigid axially Vwithout the `addition of metal and Withoutaltering the'original thickness of the v.Sheet steel.

. Whichvpermitsthe Wheel vto be bent Without sufv -fering permanentdeformation- The Wheel'is` m'ade entirely of o sheet steel, usingordinary vention accordingly lis not to be limited'thereto,

Weclaim: I As a new .article of manufac to the tubular hub along thevcircuitous line jof contactbetween said'hub' andl said Wheel, and

cu'rved teeth integral Withy the inner portion,` the`` I o end regionsof the teeth' being bentfsubstantially' f: at right angles to the planeo fy the wheel. f`

lWALfI'oN FRECHTHNG. o ;JOHN PUL AHLBRANDI'.

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